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https://issues.apache.org/jira/browse/HBASE-20066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16376077#comment-16376077
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Duo Zhang commented on HBASE-20066:
-----------------------------------
Review board link:
https://reviews.apache.org/r/65802/
> Region sequence id may go backward after split or merge
> -------------------------------------------------------
>
> Key: HBASE-20066
> URL: https://issues.apache.org/jira/browse/HBASE-20066
> Project: HBase
> Issue Type: Bug
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Priority: Critical
> Fix For: 2.0.0-beta-2
>
> Attachments: HBASE-20066.patch
>
>
> The problem is that, now we have markers which will be written to WAL but not
> in store file. For a normal region close, we will write a sequence id file
> under the region directory, and when opening we will use this as the open
> sequence id. But for split and merge, we do not copy the sequence id file to
> the newly generated regions so the sequence id may go backwards since when
> closing the region we will write flush marker and close marker into WAL...
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